Abstract: A flow selector device whose fluid flow is regulated by the rotational setting of a rotor body in a housing; and a split retainer form of an abutment, releasably held between opposed abutments of the rotor body and the housing body, serves to restrain the rotor body against movement axially of the housing as otherwise would be urged by the axial force result of the actuation of a spring pressed rotor-indexing detent feature and of a sealing feature, both of which are carried by the housing and have an effect of pushing the rotor body axially of the housing due to their compressive nature.

Abstract: A combination device for flow-regulation in an oxygen supply system, providing in a unitary device providing both an economizer valve which automatically and safely vents oxygen when the patient's demand or usage is less than the amount being constantly produced by the heat-induced evaporation (NER) of liquid oxygen in a supply reservoir, but automatically and economically stops the venting when the usage demand utilizes at least as much as the NER, in combination with a lockable flow-regulating oxygen-supply valve which can be pre-set to permit only a certain maximum flow rate of the oxygen although permitting the flow to be moderated to less than that maximum flow rate, thus giving an oxygen-therapy patient some control of oxygen flow-rate although preventing overdose.

Abstract: A calibrated oxygen metering orifice for a portable oxygen supply kit is made by first forming a cylindrical hole in a valve body, then progressively pressing into the hole a plug of conforming cross section having in its surface a scored slot of progressively decreasing cross-sectional area which defines with the wall of the hole an orifice of a size depending on the depth to which the plug is inserted in the hole, monitoring the gas flow rate through such orifice as the plug is pressed into the hole, and stopping the plug at a position which gives the desired calibrated gas flow rate.